steveobar

have a 85 streetported 13b 6 port ,holley blue pump /reg and a 650 demon carb,i set floats on carb, car seems fine then maybe 5- 15 minutes later secondarys fuel level raises and drips out gas out of secondary at idle.and when driving causing sputtering?any help would be helpful thanks.

FB_rad

You may need to lower the fuel pressure.

ArmyOfOne

iTrader: (12)

fuel pressure should be around 6 psi.

tranquilo

Interesting... I didn't realize that other carbs besides RB Holleys and Webers are compatible with rotaries. What type of modifications did you need to make? Is there an advantage of running a Demon carb? Not trying to thread jack bro but this is very interesting subject.

DivinDriver

iTrader: (15)

(hopefully he's premixing)

cmanns

I'm pretty sure you can use any carb for a rotary, the carb is just controlling the air/fuel volume/mixture

You just don't want too big of a carb, or you'd choke the low end.

I wonder if a 650 carb is too big for a sp 13b 6port

Jimbo II

Possibly, fuel pressure would be an issue too, are you running a fuel pressure regulator?